x(x-5)+1=3x(x+3)

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Solution for x(x-5)+1=3x(x+3) equation:


Simplifying
x(x + -5) + 1 = 3x(x + 3)

Reorder the terms:
x(-5 + x) + 1 = 3x(x + 3)
(-5 * x + x * x) + 1 = 3x(x + 3)
(-5x + x2) + 1 = 3x(x + 3)

Reorder the terms:
1 + -5x + x2 = 3x(x + 3)

Reorder the terms:
1 + -5x + x2 = 3x(3 + x)
1 + -5x + x2 = (3 * 3x + x * 3x)
1 + -5x + x2 = (9x + 3x2)

Solving
1 + -5x + x2 = 9x + 3x2

Solving for variable 'x'.

Reorder the terms:
1 + -5x + -9x + x2 + -3x2 = 9x + 3x2 + -9x + -3x2

Combine like terms: -5x + -9x = -14x
1 + -14x + x2 + -3x2 = 9x + 3x2 + -9x + -3x2

Combine like terms: x2 + -3x2 = -2x2
1 + -14x + -2x2 = 9x + 3x2 + -9x + -3x2

Reorder the terms:
1 + -14x + -2x2 = 9x + -9x + 3x2 + -3x2

Combine like terms: 9x + -9x = 0
1 + -14x + -2x2 = 0 + 3x2 + -3x2
1 + -14x + -2x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
1 + -14x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-0.5 + 7x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 7x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 7x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 7x + x2 = 0 + 0.5
7x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
7x + x2 = 0.5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 0.5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 0.5 + 12.25

Combine like terms: 0.5 + 12.25 = 12.75
12.25 + 7x + x2 = 12.75

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 12.75

Calculate the square root of the right side: 3.570714214

Break this problem into two subproblems by setting 
(x + 3.5) equal to 3.570714214 and -3.570714214.

Subproblem 1

x + 3.5 = 3.570714214 Simplifying x + 3.5 = 3.570714214 Reorder the terms: 3.5 + x = 3.570714214 Solving 3.5 + x = 3.570714214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 3.570714214 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 3.570714214 + -3.5 x = 3.570714214 + -3.5 Combine like terms: 3.570714214 + -3.5 = 0.070714214 x = 0.070714214 Simplifying x = 0.070714214

Subproblem 2

x + 3.5 = -3.570714214 Simplifying x + 3.5 = -3.570714214 Reorder the terms: 3.5 + x = -3.570714214 Solving 3.5 + x = -3.570714214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -3.570714214 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -3.570714214 + -3.5 x = -3.570714214 + -3.5 Combine like terms: -3.570714214 + -3.5 = -7.070714214 x = -7.070714214 Simplifying x = -7.070714214

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.070714214, -7.070714214}

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